CVE-2026-64395 | In the Linux kernel, the following vulnerability has been re… | CVSS 7.5 HIGH

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: require source read access for duplicate extents FSCTL_DUPLICATE_EXTENTS_TO_FILE passes the source file directly to vfs_clone_file_range() or vfs_copy_file_range() without checking the SMB access mask granted to the source handle. A handle opened with attribute access can consequently be used to copy file contents into an attacker-readable destination. Require FILE_READ_DATA on the source handle before either VFS operation, matching other ksmbd data-copy paths.

Metadata

CVE ID: CVE-2026-64395
State: PUBLISHED
Assigner: Linux
Reserved: 2026-07-19 15:36 UTC
Published: 2026-07-25 08:50 UTC
Last updated: 2026-07-27 05:00 UTC
Vendor / Product: Linux / Linux
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products (2)

Vendor	Product	Platform	Versions
Linux	Linux	—	eb817368f50c1cbe1bd07044124aad7db6330e3a < 2d2ab6983620c2d60ce7db72133984ca3873b929, eb817368f50c1cbe1bd07044124aad7db6330e3a < 67bdad9cf01b25030e3bf00bbce6c309319d6663, eb817368f50c1cbe1bd07044124aad7db6330e3a < b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f, eb817368f50c1cbe1bd07044124aad7db6330e3a < db231af842868268839f9f9619c68cb27830d8be …
Linux	Linux	—	5.15, 0 < 5.15, 6.1.178 ≤ 6.1., 6.6.145 ≤ 6.6. …

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References (6)